Drucker, P. F. (1964). Managing for Results. ELSEVIER.
Lua i Stíl Chicago (17ú heag.)Drucker, Peter F. Managing for Results. ELSEVIER, 1964.
Lua MLA (8ú heag.)Drucker, Peter F. Managing for Results. ELSEVIER, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.